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Rheiformes
plural noun
Rhe·ifor·mes
\ˌrēəˈfȯr(ˌ)mēz\
Definition of Rheiformes
: an order of birds that are intermediate in some respects between the ostriches and the emus and cassowaries and that comprise the recent and extinct rheas
From the M-W Editors
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Origin and Etymology of rheiformes
New Latin, from Rhea + -iformes
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